Columbo

Spinster Ruth Lytton, curator of the financially troubled, family-owned Lytton Museum, blackmails security guard Milton Shaeffer into helping her carry out a plan to rob the museum for needed insurance money. But the clever woman, harboring feelings of hostility toward her family, carries the plan one step further to the surprise of Shaeffer and her brother, Edward. Ruth offers an innocent façade while finalizing the plan - revenge against her sister, Phyllis, by implicating the latter’s daughter, Janie.